JPH0284565A - Moisture absorbing and releasing synthetic fiber - Google Patents

Abstract

PURPOSE:To obtain the subject fiber, such as polyester-based, polyamide-based, polyacrylonitrile-based or polyurethane-based fiber, containing a specific amount of cellulosic ultrafine powder adhered to the surface thereof and excellent in both of the moisture absorbing and releasing properties. CONSTITUTION:The objective fiber containing cellulosic ultrafine powder (preferably cellular hemp ultrafine powder) having <=10mu diameter in an amount of 0.1-20wt.% based on a synthetic fiber adhered to the surface thereof.

Description

[Detailed description of the invention] It is related to.

(Prior art) Synthetic fibers, especially long and short fibers such as polyester fibers and polyamide fibers, have been widely used in clothing, bedding products, industrial materials, etc. Therefore, it does not have the ability to absorb moisture.

Therefore, when used for clothing, for example, the current situation is that the sweat removal function is insufficient and the comfort level is not fully satisfied.

In order to improve this drawback of synthetic fibers, methods such as blending hydrophilic polymers, attaching hydrophilic substances to the surface by surface coating or grout polymerization in post-processing, and making composite fibers with hydrophilic components (for example, Publication No. 119220/1982) and the like have been proposed.

However, in the method of blending hydrophilic components or coating the surface, the rate at which moisture is released once absorbed is 1'P? Since it is slow, it has the disadvantage that it tends to cause discomfort such as stickiness when it comes into contact with the skin.

On the other hand, a technique is known in which, for example, cellulose acetate is attached to polyester fibers to impart dirt release properties and moisture transfer properties (Japanese Patent Laid-Open No. 54-T38699).

(Problems to be Solved by the Invention) In the above method, the cellulose compound is dissolved in a solvent and attached to polyester fibers.

Perhaps because the cellulose compound adheres smoothly over the entire fiber surface, it retains the slimy feel characteristic of synthetic fibers. The moisture absorption and moisture release properties were also at the same level.

The present invention eliminates these drawbacks of the prior art.

The purpose of the present invention is to provide a synthetic fiber that has sufficient moisture absorption and moisture release properties and at the same time provides a dry and supple touch.

(Means for Solving the Problems) As a result of intensive studies to solve these problems, the inventors of the present invention found that by fixing fine cellulose powder to the surface of synthetic fibers, a moisture absorption system with unprecedented performance was achieved. The present invention was developed based on the discovery that it is possible to obtain synthetic fibers that have elasticity, moisture release properties, and are dry and soft to the touch.

That is, the gist of the present invention is to obtain a synthetic fiber characterized in that 0.1 to 20% by weight of ultrafine cellulose powder with a diameter of 10μ or less is fixed to the surface of the synthetic fiber. .

Note that the synthetic fibers referred to in the present invention include polyester fibers, polyamide fibers such as nylon 6 and nylon 6.6,
It refers to polyacrylonitrile fibers, polyester fibers, etc., and the yarn refers to long fiber multifilament yarns and short fiber staple yarns.

Here, polyester refers to ethylene terephthalate units or butylene terephthalate, as well as phthalic acid, isophthalic acid, 5-sulfoisophthalic acid, 2,6-naphthalene dicarboxylic acid, trimellitic acid, succinic acid, adipic acid, Aromatic or aliphatic polycarboxylic acids such as sebacic acid, bisphenol A,
Aromatic or aliphatic polyols such as hydroquinone, diethylene glycol, polyethylene glycol, 1,4-butanediol, 1,6-hexanediol, trimethylolpropane, p-oxybenzoic acid, sodium 2-hydroxy-6-naphthoate, etc. It may also be one in which a small amount of oxycarboxylic acid or the like is copolymerized.

In addition, ultrafine cellulose powder with a diameter of 10μ or less.

It can be obtained by freezing and crushing cellulose fibers.

If the diameter exceeds 10μ, if it is fixed to the fiber.

The texture is rough and undesirable.

Among the cellulose ultrafine powders, it is more preferable to use porous hemp cellulose ultrafine powders.

What is porous hemp cellulose ultrafine powder?

It has a relatively large hollow part in the center, and the sheath part is a porous, irregularly shaped fine powder with a diameter of about 1 to several microns.

This can be obtained by using hemp as a raw material, pre-treatment with enzymes, chemical treatment, purification, and mechanical crushing (Tosco), etc.

If the amount of the ultrafine powder adhered to the synthetic fiber is less than 0.1% by weight, it is difficult to achieve the effects of the present invention.

Also, the same (if it is fixed in an amount exceeding 20% by weight).

This is undesirable as the ultrafine powder may fall off after the fixing step and the texture may deteriorate.

A suitable method for fixing the ultrafine powder to fibers is to immerse synthetic fibers such as threads, woven/knitted fabrics, nonwoven fabrics, etc. in the following dispersion and then heat-treat the fibers.

The dispersion liquid is ■ An aqueous dispersion of emulsion resin such as polyacrylic acid ester or polyurethane resin or a solvent solution in which ultrafine powder is dispersed. These include those in which ultrafine powder is dispersed.

Alternatively, the synthetic fiber threads (long fibers) may be fixed in advance and then cut as appropriate, and the short fibers may be used as stuffed cotton, spun yarn, or nonwoven fabric.

After immersing the synthetic fiber in the dispersion, it is dried at 60 to 100°C.

The fine powder can be fixed to the fibers by heat treatment at 120 to 180°C for several seconds to several minutes.

Furthermore, when melt-spinning the synthetic fiber yarn, the surface of the synthetic fiber yarn is passed through a fluidized bed of ultrafine cellulose powder or sprayed with an air flow containing ultrafine cellulose powder before the surface is completely solidified. Ultrafine cellulose powder may be directly fixed to the surface.

(Function) The ultrafine cellulose powder used in the present invention, especially Table 1 [Leg Table 2, Texture evaluation is based on a sensory test of dry fabric.

◎ Dry and supple touch OW and dry and supple touch Δ Rough and rough touch × Slimy touch Reference example 1 A plain-woven polyester fabric that has been given water absorbency through a commercially available post-processing process was used. Although the moisture absorption was good at 0.6 seconds, the moisture release was poor at 4.4 seconds.

Example 5 A test was carried out in the same manner as in Example 1, except that ultrafine cellulose powder with an average particle size of 7 μm obtained by freeze-pulverizing cotton was used instead of ultrafine porous hemp cellulose powder.

Ultrafine powder of 1 weight width is fixed to the obtained fabric, and -v
It was ＋, dry and had a gentle touch. Hygroscopicity is 0.
6 seconds, and the moisture release property was 1.2.

Comparative Example 6 Comparative Example 6 was carried out in the same manner as in Example 5 except that ultrafine cellulose powder having an average particle size of 15 μm was used.

The resulting fabric had a 1 weight width of ultrafine powder adhered to it, giving it a rough touch. Moisture absorption is 07 seconds.

The moisture release property was 1.1 inches.

Example 6 Nylon 6 with an intrinsic viscosity of 1.1 is melt spun and stretched.

A long fiber of 75 denier and 36 filaments was obtained.

This was made into a plain-woven fabric.

This fabric was treated in the same manner as in Example 1.

The moisture absorption was 0.3 seconds, and the moisture release was 1.0%.

Note that the fabric that was not treated with ultrafine cellulose powder fixation had a moisture absorption rate of 18 seconds and a moisture release rate of 1.0%.

(Effects of the Invention) According to the present invention, it has become possible to obtain a synthetic fiber having excellent hygroscopicity and moisture-releasing properties.

Patent applicant: Nihon Ester Co., Ltd. 1 other person teenager Reason Man child ball male

Claims (2)

[Claims] (1) A synthetic fiber characterized in that 0.1 to 20% by weight of ultrafine cellulose powder with a diameter of 10 μm or less is fixed to the surface of the synthetic fiber. (2) The synthetic fiber according to claim 1, wherein the ultrafine cellulose powder is porous hemp cellulose ultrafine powder.